There are many causes for the symptoms you describe. They may or may not be related to your head injury
. You need to have certain blood and investigative tests done. An MRI of the brain to rule out any lesion in the pituitary is important. A visual field
analysis to see if there is any defective vision is just as needed. Get a blood workup that will check for the thyroid
levels as well as the hormones of the pituitary gland
, cortisol and TSH. Try and get these done early to localise your cause and treatment can be started early to improve your problem.